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ICSE Class 10 Chemistry Question 1 of 22

Solved 2016 Question Paper ICSE Class 10 Chemistry — Question 2

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Question

Question 1(b-i)

An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is:

  1. 17
  2. 11
  3. 18
  4. 20
Answer

17

Reason — The element with atomic number 19 has electronic configuration of (2, 8, 8, 1) and that with atomic number 17 has electronic configuration of (2, 8, 7). This element with atomic number 17 needs 1 electron to complete its octet whereas element with atomic number 19 has an extra electron. Hence, an element with atomic number 19 is most likely to combine with the element with atomic number 17.